Convert Kilobytes to Bytes

To convert kilobytes (KB) to bytes (B), multiply the number of kilobytes by 1,024.

• Formula: bytes = kilobytes × 1,024
• Example: 5 KB = 5 × 1,024 = 5,120 bytes

This works for the common binary file size standard used in most computer storage and memory.

How many bytes are in a kilobyte (KB)?

It depends on which standard you use. In most everyday file sizes, 1 kilobyte (KB) = 1,000 bytes. In some computer memory contexts, people use 1 KB = 1,024 bytes, but that value is more accurate for kibibytes (KiB).

What’s the difference between KB and KiB?

KB (kilobyte) usually means 1,000 bytes (base-10).
KiB (kibibyte) means 1,024 bytes (base-2).
KiB is the clearer term when you mean 1,024 bytes.

Why do some sources say 1 KB equals 1,024 bytes?

Computers work in base-2, so sizes often land on powers of two. For a long time, many systems used “KB” to mean 1,024 bytes out of habit. Today, KiB is the correct name for 1,024 bytes, while KB is most often 1,000 bytes.

What is the formula to convert kilobytes to bytes?

Use one of these based on the standard you need:

• Decimal (SI): bytes = kilobytes × 1,000
• Binary: bytes = kilobytes × 1,024 (this matches KiB)

How do I convert 5 KB to bytes?

Using the common decimal standard:
5 KB = 5 × 1,000 = 5,000 bytes

If you mean the binary amount:
5 KB (as 1,024-byte units) = 5 × 1,024 = 5,120 bytes

How do I convert 100 KB to bytes?

Using decimal KB:
100 KB = 100 × 1,000 = 100,000 bytes

Using binary units:
100 × 1,024 = 102,400 bytes

Is 1,000 bytes the same as 1 KB?

In decimal units, yes: 1 KB = 1,000 bytes.
If you see 1 KB used as 1,024 bytes, that’s using the binary convention (more correctly 1 KiB).

When should I use 1,000 vs 1,024 in KB to bytes conversion?

Use 1,000 when talking about file sizes in storage and downloads, since many systems label those in decimal KB. Use 1,024 when you’re working with memory, low-level computing, or when a tool clearly uses binary units.

How many bytes are in 1,024 KB?

Using decimal KB:
1,024 KB = 1,024,000 bytes

Using binary units:
1,024 × 1,024 = 1,048,576 bytes (this equals 1 MiB in binary terms)

Does capitalization matter, like KB vs Kb?

Yes. KB means kilobytes. Kb means kilobits.
A byte is 8 bits, so mixing these can cause big mistakes.

How do I convert KB to bytes if the value includes decimals?

Multiply the KB value by the right factor:

• Decimal: bytes = KB × 1,000
• Binary: bytes = KB × 1,024

Example (decimal): 2.5 KB = 2.5 × 1,000 = 2,500 bytes

Why does my file size look different on different systems?

Some systems show sizes using 1,000-based units, while others use 1,024-based units. The label may still say “KB,” even when the math differs. That’s why the same file can show slightly different KB values.

What is the smallest unit, a byte or a kilobyte?

A byte is smaller. A kilobyte is a group of bytes:

• 1 KB = 1,000 bytes (common)
• 1 KiB = 1,024 bytes (binary standard)